Foundry resins

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B - Operations, Transporting

22

C

6/42

B22C 1/20 (2006.01) B22C 1/16 (2006.01) B22C 1/22 (2006.01) C08G 18/64 (2006.01)

Patent

CA 1331421

Abstract of the Disclosure A process for making sand cores or molds is disclosed; the completed cores and molds as well as a binder for holding the sand particles together. The resin binder is used in the process and in the finished product comprising lignin dissolved in a suitable solvent reacted on or cured with an isocyanate material. Curing can be accomplished by the use of an amine along with a catalyst if desired. A polyether polyol may be integrated with the lignin to vary the physical characteristics of the binder.

590736

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